Bill is twenty-five years old. His uncle had promised in writing to pay him $2,000 if Bill would refrain from drinking alcohol for one year. Bill refrained from drinking alcohol for one year. However, his uncle now refuses to pay Bill as agreed. The uncle claims that because Bill suffered no detriment by refraining from alcohol, and that because his non-drinking did not constitute consideration, no contract was formed. If Bill sues his uncle, Bill will:_______________